Chapter 2
SQM-242 CoDep
2-10
2.7 View Menu: Card Setup
This dialog controls the most basic functions of the SQM-242 card. It also provides
useful installation and troubleshooting information.
Simulate:
Normally the SQM-242 card uses the quartz crystals as inputs for controlling
the source outputs. The SAM-242 card uses analog input voltages for control.
Simulate mode simulates these inputs. No SQM-242 or SAM-242 card needs to be
installed for the simulate mode.
Card 1, Card 2, Analog:
Shows the firmware revision of each installed card. A value of
0.00 indicates that the card is not seen by the software, and is probably not installed
properly in Windows. See Section 1.2 for installation and troubleshooting information.
Frequency:
The frequency values for the quartz crystal sensors used as inputs to the
SQM-242. Sensor readings outside the Max/Min values cause a crystal fail error.
Values 1MHz to 10MHz are permitted, but 6MHz crystals are most common.
Min/Max values are also used to calculate the % Life remaining on the sensor screen.
For 6 MHz crystals, set the Max value to the highest possible new crystal frequency
(typically 6.1MHz). Set the Initial frequency to the nominal new crystal frequency
(6MHz). Set Min Frequency to the lowest useable crystal frequency (typically 5MHz).
Keep in mind that some materials cause premature crystal failure.
Period:
Sets the measurement period between .2 seconds (5 readings per second) and
2 seconds. A longer period gives higher reading accuracy, especially in low rate
applications.
Filter:
Sets the number of readings used in the reading filter. A low setting gives rapid
response to process changes, high settings give smoother readings.
Log to File:
Enables data logging to disk. Enter a filename without path to save data in
the application directory. Enter a full path to save data in another directory. Data is
saved in comma delimited format easily imported import into any spreadsheet.
